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Exam 6: Restless Earth: Earthquakes, Geologic Structures, and Mountain Building

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Question 21

Multiple Choice

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The earthquake belt with the greatest level of activity is the ________.

A) San Andreas Fault
B) Alpine-Himalayan Belt
C) East Pacific Rise
D) Circum-Pacific Belt

E) A) and D)
F) B) and C)

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Question 22

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In this figure, the letter "C" is the location.

A) True
B) False

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Question 23

Multiple Choice

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Mountain belts form by ________.

Domes are broad circular downwarped structures.

The ________ is the cool, brittle, outer layer of Earth that includes the crust and uppermost mantle.

In a reverse fault, the hanging wall block moves up with respect to the footwall block.

Label each of the blanks on the figure showing the source of earthquakes.

This photo shows an anticline.

The mountains and valleys of the Basin and Range Province of western United States formed in response to tensional stresses and normal faulting.

Horsts and grabens are bounded by ________.

Sketch a cross-sectional view of Earth's interior, and label each of the layers you depict.

Describe the steps you would go through to determine the source of an earthquake, provided you had access to three seismographs that recorded the event.

Seismic waves travel faster ________.

Which kind of seismic wave is responsible for the most shaking (and thus, the most damage to human structures) ?

Examine the graph. After a P wave (blue line) has been traveling for 5 minutes, how much distance has been covered by an S wave (red line) generated by the same earthquake?

Which location has its formation depicted in these figures, (a)the Basin and Range, (b)the Himalayas, or (c)the Andes? Discuss the features that support your conclusion.

The east coast of present-day North America is a good example of a(n)________ continental margin.

Which kind of seismic wave is fastest-moving?

Sediment scraped off the subducting plate builds up in a(n)________. A nice example of this can be seen in central California's coast ranges.

What kind of fold is illustrated in this photograph? At what sort of tectonic boundary situation is it likely to have formed?